‘Cat and Dog Jumping’ by National Media Museum on Flickr.

‘Mother and Child’ by National Media Museum on Flickr.

Via Flickr:
Henry Essenhigh Corke (1883-1919); Autochrome
Photo from approx. 1910. 

Collection of National Media Museum

This is an autochrome - an early colour process which used a glass plate covered in microscopic, red, green and blue grains of potato starch.